Add language: Scottish Gaelic (#7864)

* Create messages.po

* Update app.config.js

* Update lingui.config.js

* Update dates.ts

* Update helpers.ts

* Update i18n.ts

* Update i18n.web.ts

* Update languages.ts

src/locale/languages.ts

@@ -19,6 +19,7 @@ export enum AppLanguage {
   fi = 'fi',
   fr = 'fr',
   ga = 'ga',
+  gd = 'gd',
   gl = 'gl',
   hi = 'hi',
   hu = 'hu',
@@ -64,6 +65,7 @@ export const APP_LANGUAGES: AppLanguageConfig[] = [
   {code2: AppLanguage.fi, name: 'Suomi – Finnish'},
   {code2: AppLanguage.fr, name: 'Français – French'},
   {code2: AppLanguage.ga, name: 'Gaeilge – Irish'},
+  {code2: AppLanguage.gd, name: 'Gàidhlig – Scottish Gaelic'},
   {code2: AppLanguage.gl, name: 'Galego – Galician'},
   {code2: AppLanguage.hi, name: 'हिंदी – Hindi'},
   {code2: AppLanguage.hu, name: 'magyar – Hungarian'},